I need a SQL update statement for updating a particular field of all the rows with a string "test" to be added in the front of the existing value.
For example, if the existing value is "try" it should become "testtry".
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5 Answers
You can use the CONCAT function to do that:
UPDATE tbl SET col=CONCAT('test',col);
If you want to get cleverer and only update columns which don't already have test prepended, try
UPDATE tbl SET col=CONCAT('test',col)
WHERE col NOT LIKE 'test%';
Comments
UPDATE tablename SET fieldname = CONCAT("test", fieldname) [WHERE ...]
1 Comment
nirmesh khandelwal
update TICKET set status_details = CONCAT(status _details,'abc') where ticket_id=75108; ERROR 1583 (42000): Incorrect parameters in the call to native function 'CONCAT'
Many string update functions in MySQL seems to be working like this:
If one argument is null, then concatenation or other functions return null too.
So, to update a field with null value, first set it to a non-null value, such as ''
For example:
update table set field='' where field is null;
update table set field=concat(field,' append');
Comments
That's a simple one
UPDATE YourTable SET YourColumn = CONCAT('prependedString', YourColumn);
1 Comment
Jukka Dahlbom
Correct up to the WHERE clause, where you only concat test to columns already starting with test. So: foo -> foo footest -> footest testfoo -> testtestfoo
- UPDATE table_name SET Column1 = CONCAT('newtring', table_name.Column1) where 1
- UPDATE table_name SET Column1 = CONCAT('newtring', table_name.Column2) where 1
- UPDATE table_name SET Column1 = CONCAT('newtring', table_name.Column2, 'newtring2') where 1
We can concat same column or also other column of the table.
